The Lost Moment

The Lost Moment is a 1947 American psychological thriller film with elements of horror directed by Martin Gabel and starring Robert Cummings, Susan Hayward and Agnes Moorehead.

Lewis assumes a false identity, not immediately announcing his intent. He is given lodging by Juliana and meets greatniece Tina, a pianist.In time, he discovers that Juliana is in dire need of money, even offering to sell him a valuable painting. He also learns that Tina has a schizophrenic personality, at times deluding herself into believing that she is Juliana, and that Ashtons letters were written to her. ........

Source: Wikipedia